U.S. patent application number 17/292074 was filed with the patent office on 2021-11-18 for method of treating tunnel collapse with roof-contacted shield support.
The applicant listed for this patent is CHINA COMMUNICATIONS CONSTRUCTION CO., LTD, HEBEI FEIPU ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD., QINGDAO FIRST MUNICIPAL ENGINEERING CO., LTD, QINGDAO WEST COAST RAIL TRANSIT CO., LTD, SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY. Invention is credited to Wensheng HE, Lide HOU, Shibin JIANG, Biao KONG, Chuan LI, Weizhou LI, Quanwei LIU, Xiangbao MENG, Hailiang WANG, Shuai WANG, Zhenbiao WANG, Lin XIN, Jiufang XIONG, Xuexiang XU, Fu YU, Wenming ZHANG, Yong ZHANG.
Application Number | 20210355828 17/292074 |
Document ID | / |
Family ID | 1000005812067 |
Filed Date | 2021-11-18 |
United States Patent
Application |
20210355828 |
Kind Code |
A1 |
XIN; Lin ; et al. |
November 18, 2021 |
METHOD OF TREATING TUNNEL COLLAPSE WITH ROOF-CONTACTED SHIELD
SUPPORT
Abstract
A method of treating tunnel collapse includes mounting a shield
plate, a column, a support column to form a combined support and
moving the combined support onto an operation platform, lifting up
the combined support, and enabling the height of canopy to be
greater than the height of an initial supporting arch. Actively
contacting a surface of a collapse cavity by a fixed support column
and bearing a load, and lifting a movable support column to the top
of the collapse cavity and bearing a load. Mounting an initial
supporting arch, and welding the initial supporting arch with the
support column. Removing a hydraulic prop after the support column
contacting the initial supporting arch is cut off and the load of
the shield plate is transferred to a supporting shed. Mounting an
exhaust pipe and a filling material pumping pipe, and pumping a
filling material into a collapse cavity space.
Inventors: |
XIN; Lin; (Qingdao City,
CN) ; JIANG; Shibin; (Qingdao City, CN) ; YU;
Fu; (Qingdao City, CN) ; WANG; Hailiang;
(Qingdao City, CN) ; LI; Weizhou; (Qingdao City,
CN) ; LIU; Quanwei; (Qingdao City, CN) ; HE;
Wensheng; (Qingdao City, CN) ; LI; Chuan;
(Qingdao City, CN) ; WANG; Zhenbiao; (Qingdao
City, CN) ; KONG; Biao; (Qingdao City, CN) ;
MENG; Xiangbao; (Qingdao City, CN) ; ZHANG; Yong;
(Qingdao City, CN) ; ZHANG; Wenming; (Qingdao
City, CN) ; HOU; Lide; (Qingdao City, CN) ;
XIONG; Jiufang; (Qingdao City, CN) ; XU;
Xuexiang; (Qingdao City, CN) ; WANG; Shuai;
(Qingdao City, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
CHINA COMMUNICATIONS CONSTRUCTION CO., LTD
HEBEI FEIPU ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD.
QINGDAO WEST COAST RAIL TRANSIT CO., LTD
QINGDAO FIRST MUNICIPAL ENGINEERING CO., LTD |
Qingdao City
Beijing
Shijiazhuang
Qingdao City
Qingdao City |
|
CN
CN
CN
CN
CN |
|
|
Family ID: |
1000005812067 |
Appl. No.: |
17/292074 |
Filed: |
July 20, 2020 |
PCT Filed: |
July 20, 2020 |
PCT NO: |
PCT/CN2020/102910 |
371 Date: |
May 7, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E21D 11/183 20130101;
E21D 15/44 20130101; E21D 19/04 20130101; E21D 11/105 20130101 |
International
Class: |
E21D 11/10 20060101
E21D011/10; E21D 19/04 20060101 E21D019/04; E21D 11/18 20060101
E21D011/18; E21D 15/44 20060101 E21D015/44 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 11, 2020 |
CN |
202010164068.9 |
Claims
1. A method of treating tunnel collapse with a roof-contacted
shield support, comprising the following steps: at step 1, fixedly
mounting a column, a fixed support column, a movable support
column, a transverse canopy and a longitudinal canopy on a shield
plate to form a combined support, wherein an upper connection plate
of the movable support column is fixed on an upper surface of the
shield plate; at step 2, leveling gravels below a collapse cavity
to form an operation platform, and moving the combined support to
be above the operation platform; at step 3, transporting a single
hydraulic prop to the operation platform, erecting and lifting up
the single hydraulic prop to fit each single hydraulic prop with
the transverse canopy or the longitudinal canopy; at step 4,
continuing lifting up the single hydraulic prop to enable heights
of the transverse canopy, the longitudinal canopy, the shield plate
and a guide pipe to be greater than a mounting height of an initial
supporting arch; after the fixed support column contacts a surface
of the collapse cavity, slowly increasing a bearing capacity of the
single hydraulic prop to a rated working resistance, and then,
locking a liquid supply valve; at step 5, disposing a single
hydraulic prop below the movable support column to fit a top cover
of the single hydraulic prop with a lower connection plate of the
movable support column, so as to continue lifting up the single
hydraulic prop below the movable support column; after the upper
connection plate of the movable support column contacts the surface
of the collapse cavity, slowly increasing a bearing capacity of the
single hydraulic prop to the a rated working resistance, and then,
locking a liquid supply valve; at step 6, erecting the initial
supporting arch below the shield plate, and then connecting the
initial supporting arches to form an initial supporting shed; at
step 7, fixing intersection points of the initial supporting arch
and the column/the movable support column by welding, and cutting
off the parts of the column and the movable support column within a
contour of the initial supporting arch; at step 8, after the single
hydraulic props are removed, inserting a filling material pumping
pipe into a reserved concrete hole of the shield plate, inserting
an exhaust pipe into a reserved air hole, and hanging a metal net
on the initial supporting arch; and at step 9, spraying
fast-setting concrete to the initial supporting arch, injecting a
filling material into the collapse cavity through the filling
material pumping pipe, and discharging air in the collapse cavity
through the exhaust pipe until the collapse cavity is filled up
with the filling material.
2. The method of treating tunnel collapse with a roof-contacted
shield support according to claim 1, wherein at step 1, the
transverse canopy and the longitudinal canopy of the combined
support are fixed on a lower surface of the shield plate, the fixed
support column is fixed on the upper surface of the shield plate,
the movable support column is penetrated through a guide hole on
the shield plate and overlapped on the shield plate, and the column
is fixedly supported on the lower surface of the shield plate.
3. The method of treating tunnel collapse with a roof-contacted
shield support according to claim 2, wherein one or more movable
support columns are disposed on the shield plate, and the movable
support column, the guide hole and the guide pipe are
correspondingly arranged; the contour size of the lower connection
plate of the movable support column is less than a contour size of
an inner wall of the guide pipe, and a toothed groove mated with a
top cover of the single hydraulic prop is further disposed on the
lower connection plate; a contour size of the upper connection
plate of the movable support column is greater than a contour size
of the guide hole, and the upper connection plate is fixed on the
upper surface of the shield plate by bolts.
4. The method of treating tunnel collapse with a roof-contacted
shield support according to claim 1, wherein at step 2, the
combined support is moved to be above the operation platform by
using an excavator; or, the combined support is fixed on a motor
vehicle which then moves onto the operation platform to complete
the lifting-up of the combined support and the mounting of the
initial supporting arch on the motor vehicle.
5. The method of treating tunnel collapse with a roof-contacted
shield support according to claim 1, wherein at step 3, an upper
end of the single hydraulic prop is supported on the transverse
canopy or the longitudinal canopy, and a lower end of the single
hydraulic prop is fixed on the ground by a prop shoe; the prop shoe
is fixedly connected by a rigid structure.
6. The method of treating tunnel collapse with a roof-contacted
shield support according to claim 1, wherein at step 4, after the
fixed support column contacts the surface of the collapse cavity,
the single hydraulic prop is adjusted and the fixed support column
actively provides a supporting force for the collapse cavity; at
step 5, after the movable support column contacts the surface of
the collapse cavity, the single hydraulic prop is adjusted, and the
movable support column actively provides a supporting force for the
collapse cavity.
7. The method of treating tunnel collapse with a roof-contacted
shield support according to claim 1, wherein at step 6, when the
single hydraulic prop occupies a mounting position of the initial
supporting arch, an alternative single hydraulic prop is firstly
erected at a position adjacent to the single hydraulic prop, and
then, the single hydraulic prop occupying the mounting position of
the initial supporting arch is removed.
8. The method of treating tunnel collapse with a roof-contacted
shield support according to claim 1, wherein after step 7 is
completed, a load of the shield plate is transferred from the
single hydraulic prop to the initial supporting arch.
9. The method of treating tunnel collapse with a roof-contacted
shield support according to claim 1, wherein at step 8, the exhaust
pipe protrudes to the top of the collapse cavity, and the height of
an outlet of the filling material pumping pipe is less than a
height of a port of the exhaust pipe; at step 9, the fast-setting
concrete is sprayed onto the initial supporting arch to form a
closed shell.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the field of tunnel and
underground engineering operation technologies, and in particular
to a method of treating tunnel collapse with a roof-contacted
shield support.
BACKGROUND
[0002] At present, common methods of treating tunnel collapse
accidents mainly include a pipe shed method, a backfilling method,
a cover-arch method, a small duct grouting method, a secondary
lining reinforcement method, and the like. In the pipe shed method,
a borehole parallel to a tunnel axis is drilled along an excavation
contour line and then steel pipes with different diameters are
inserted so as to form a steel pipe shed. In the backfilling
method, drilling and grouting or filling material backfilling are
performed from a ground surface or from inside a tunnel above a
collapse cavity. In the small duct grouting method, small ducts
with grouting holes are driven toward a tunnel face at a certain
elevation angle along an outer contour line of the tunnel before a
collapse body is excavated, so as to fully fill fissures of
surrounding rock by grouting and form a combination body with
certain thickness, thereby ensuring a stable tunnel contour.
[0003] Patent documents in the prior art are described below.
[0004] The patent document 1 provides a method of treating a
collapse of a tunneling working face using a penetration pipe
combination arch (publication number: CN104989434B), which
specifically includes: erecting a ring arch in a safe region,
erecting a segmented supporting arch under the protection of steel
pipes to realize the technical effect of safe, fast and effective
treatment of collapse. However, the following problems still exist:
(1) the manual operation of the collapse treatment process has high
labor intensity and low working efficiency; (2) the operators in
the collapse section are directly exposed under the collapse when
erecting the segmented supporting arch in spite of protection of
the steel pipes; especially in step 2, an arch top section of the
segmented supporting arch in the collapse region will be lifted to
higher than the contour line of an initial support of tunnel, and
the operators have to be exposed under the collapse cavity,
resulting in large potential safety hazards.
[0005] The patent document 2 provides an emergency treatment method
for collapse of a tunneling working face (publication number:
CN106545351B), which specifically includes: continuously supporting
two arch beams using a single hydraulic prop in a safe section,
forming a bearing point by use of two arch beams supported on the
arch top of the safe section, with a position of a collapse region
working face into which a wedge beam is wedged as another bearing
point. Two bearing points support the wedge beam and a bearing body
is placed on the wedge beam, so as to effectively treat collapse.
The following problems still exist: (1) low working efficiency:
although the working efficiency of the safe section is improved by
the single hydraulic prop, manual operations are still required for
the key links of the collapse section, thereby resulting in no
improvement of the working efficiency; (2) existence of potential
safety hazards: although the operators are protected by the wedge
beam, the operators still have to be exposed under the collapse
cavity when laying the bearing body such as a sleeper, bringing a
large potential safety hazard; (3) limitation of effectiveness: the
surrounding rocks of the working face of the collapse section are
soft rocks, resulting in instability of bearing points; or, when
the surrounding rocks of the working face of the collapse section
are hard rocks, the wedge top beam cannot be wedged into the
surrounding rocks of the working face to form a bearing point. In
these two circumstances, the technical solution recorded herein
cannot be achieved, and thus the anticipated technical effect
cannot be realized.
[0006] In addition, when the single hydraulic prop is used, if roof
contact cannot be carried out in time, a supporting force cannot be
applied to the roof; when the roof of the collapse cavity
collapses, hydraulic oil of the single hydraulic prop cannot be
discharged in time when an instantaneous pressure of the collapse
suddenly increases and acts on the single hydraulic prop, thereby
resulting in a cylinder explosion accident. That is, the oil
cylinder of the single hydraulic prop instantaneously deforms or
cracks due to an impact pressure. When the single hydraulic prop is
used, the stroke of the single hydraulic prop cannot satisfy
requirements of the lifting height of the shield plate; especially
when the collapse cavity is large in depth, active supporting
cannot be applied to the surface of the collapse cavity.
SUMMARY
[0007] To solve the problems in the existing collapse treatments,
the present disclosure provides a method of treating tunnel
collapse with a roof-contacted shield support. The method solves
the technical problems: the lifting height of the single hydraulic
prop is insufficient when the collapse cavity is high, active
supporting cannot be applied to the surface of the collapse cavity,
the load at the top of the collapse cavity is transferred from the
single hydraulic prop to an initial supporting arch and the
cylinder explosion problem is likely to occur in a case of a sudden
collapse at a collapse position. The specific technical solution is
described below.
[0008] A method of treating tunnel collapse with a roof-contacted
shield support includes the following steps.
[0009] At step 1, a column, a fixed support column, a movable
support column, a transverse canopy and a longitudinal canopy are
fixedly mounted on a shield plate to form a combined support, where
an upper connection plate of the movable support column is fixed on
an upper surface of the shield plate.
[0010] At step 2, gravels below a collapse cavity are leveled to
form an operation platform, and the combined support is moved to be
above the operation platform.
[0011] At step 3, a single hydraulic prop is transported to the
operation platform, then erected, and lifted up to enable each
single hydraulic prop to be fitted with the transverse canopy or
the longitudinal canopy.
[0012] At step 4, the single hydraulic prop is further lifted to
enable heights of the transverse canopy, the longitudinal canopy,
the shield plate and a guide pipe to be greater than a mounting
height of an initial supporting arch; after the fixed support
column contacts a surface of the collapse cavity, a bearing
capacity of the single hydraulic prop is slowly increased to a
rated working resistance, and then, a liquid supply valve is
locked.
[0013] At step 5, a single hydraulic prop is disposed below the
movable support pillar to fit a top cover of the single hydraulic
prop with a lower connection plate of the movable support column,
so as to continue lifting up the single hydraulic prop below the
movable support; and after an upper connection plate of the movable
support column contacts the surface of the collapse cavity, a
bearing capacity of the single hydraulic prop is slowly increased
to the rated working resistance, and then, a liquid supply valve is
locked.
[0014] At step 6, the initial supporting arch is erected below the
shield plate, and then connected to form an initial supporting
shed.
[0015] At step 7, intersection points between the initial
supporting arch and the column/the movable support column is
fixedly welded, and the parts of the column and the movable support
column within a contour of the initial supporting arch are cut
off.
[0016] At step 8, after the single hydraulic props are removed, a
filling material pumping pipe is inserted into a reserved concrete
hole of the shield plate, an exhaust pipe is inserted into a
reserved air hole, and a metal net is hung on the initial
supporting arch.
[0017] At step 9, fast-setting concrete is sprayed to the initial
supporting arch, a filling material is injected into the collapse
cavity through the filling material pumping pipe, and air in the
collapse cavity is discharged through the exhaust pipe until the
collapse cavity is filled up with the filling material.
[0018] Preferably, at step 1, the transverse canopy and the
longitudinal canopy of the combined support are fixed on a lower
surface of the shield plate, the fixed support column is fixed on
an upper surface of the shield plate, the movable support column is
penetrated through a guide hole on the shield plate and overlapped
with the shield plate, and the column is fixedly supported on the
lower surface of the shield plate.
[0019] Further preferably, one or more movable support columns are
disposed on the shield plate, and the movable support columns, the
guide holes and the guide pipes are correspondingly arranged; the
contour size of the lower connection plate of the movable support
column is less than that of an inner wall of the guide pipe, and a
toothed groove mated with the top cover of the single hydraulic
prop is further disposed on the lower connection plate; the contour
size of the upper connection plate of the movable support column is
greater than that of the guide hole, and the upper connection plate
is fixed on the upper surface of the shield plate by bolts.
[0020] Further preferably, at step 2, the combined support is moved
to be above the operation platform by using an excavator; or, the
combined support is fixed on a motor vehicle which then moves onto
the operation platform to complete the lifting-up of the combined
support and the mounting of the initial supporting arch on the
motor vehicle.
[0021] Further preferably, at step 3, an upper end of the single
hydraulic prop is supported on the transverse canopy or the
longitudinal canopy, a lower end of the single hydraulic prop is
fixed on the ground by a prop shoe, and the prop shoe is fixedly
connected by a rigid structure.
[0022] Further preferably, at step 4, after the fixed support
column contacts the surface of the collapse cavity, the single
hydraulic prop is adjusted, and the fixed support column actively
provides a supporting force for the collapse cavity; at step 5,
after the movable support column contacts the surface of the
collapse cavity, the single hydraulic prop is adjusted, and the
movable support column actively provides a supporting force for the
collapse cavity.
[0023] Further preferably, at step 6, when the single hydraulic
prop occupies a mounting position of the initial supporting arch,
an alternative single hydraulic prop is firstly erected at a
position adjacent to the single hydraulic prop, and then, the
single hydraulic prop occupying the mounting position of the
initial supporting arch is removed.
[0024] Further preferably, after step 7 is completed, the load of
the shield plate is transferred from the single hydraulic prop to
the initial supporting arch.
[0025] Further preferably, at step 8, the exhaust pipe is protruded
into the top of the collapse cavity, and the height of an outlet of
the filling material pumping pipe is less than that of a port of
the exhaust pipe; at step 9, fast-hardening concrete is sprayed
onto the initial supporting arch to form a closed shell.
[0026] The method of treating tunnel collapse with a roof-contacted
shield support according to the present disclosure has the
following beneficial effects.
[0027] (1) The method provides a safe operation space for operators
below the collapse cavity with the shield plate of the combined
support. The fixed support column and the movable support column
can contact a roof in time and effectively support the surface of
the collapse cavity. Therefore, the probability that the collapse
cavity continues collapsing may be reduced, and the cylinder
explosion accident of the single hydraulic prop may also be
avoided. The single hydraulic prop lifts up the shield plate,
helping the erection of the initial supporting arch and realizing
smooth transition of the load of the shield plate from the single
hydraulic prop to the initial supporting arch.
[0028] In the method of treating tunnel collapse, the operation of
each step is carried out in the safe operation space, so that the
method is particularly applicable to the treatment for an initial
tunnel collapse having a relatively stable collapse cavity and a
relatively flat collapse cavity surface. The method actively
provides a supporting force by use of effective cooperation of the
single hydraulic prop and the support columns , ensuring the
supporting safety. In the method, the mounting of the initial
supporting arch is convenient, the structure of each part of the
roof-contacted shield support will not invade into the operation
space of the initial supporting arch, and the erected initial
supporting arch will also not invade into the operation space of
secondary lining, thereby avoiding the removal operation of the
initial supporting arch during the subsequent secondary lining
operation. In addition, effective grouting treatment is also
carried out for the collapse cavity space by the method, thereby
ensuring the safety of the supporting structure.
[0029] In addition, the method also has advantages of safe
operation below the collapse cavity, high mechanization, low labor
intensity, high operation efficiency, and the like.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] FIG. 1 is a structural diagram of mounting of a combined
support.
[0031] FIG. 2 is a sectional view taken along A-A in FIG. 1.
[0032] FIG. 3 is a view of direction B in FIG. 1.
[0033] FIG. 4 is a schematic diagram of mounting of a combined
support.
[0034] FIG. 5 is a schematic diagram of a process of lifting up a
single hydraulic prop.
[0035] FIG. 6 is a schematic diagram of roof contact of a fixed
support column.
[0036] FIG. 7 is a schematic diagram of roof contact of a movable
support column.
[0037] FIG. 8 is a schematic diagram of mounting of an initial
supporting arch.
[0038] FIG. 9 is a schematic diagram after removal of a single
hydraulic prop.
[0039] FIG. 10 is a schematic diagram of a collapse cavity filled
with a filling material.
[0040] FIG. 11 is a schematic diagram after treatment of a
collapse.
[0041] FIG. 12 is a schematic diagram of section C-C in FIG.
11.
[0042] FIG. 13 is a schematic diagram of an assembly structure of a
movable support column.
[0043] FIG. 14 is a schematic diagram of another assembly structure
of a movable support column.
[0044] Numerals of the drawings are described as follows: 1--shield
plate; 2--column; 3--fixed support column; 4--movable support
column; 5--transverse canopy; 6--longitudinal canopy; 7--prop shoe;
8--bolt; 9--single hydraulic prop; 10--lower surface; 11--upper
surface; 12--guide hole; 13--toothed groove; 14--guide pipe;
15--filling material pumping pipe; 16--reserved concrete hole;
17--exhaust pipe; 18--reserved air hole; 19--lower connection
plate; 20--upper connection plate; 21--column body; 22--screw hole;
23--operation platform; 24--initial supporting arch outer contour
line; 25--collapse cavity surface; 26--initial supporting arch;
27--initial supporting shed frame; and 28--collapse cavity.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0045] As shown in FIGS. 1-14, a method of treating tunnel collapse
with a roof-contacted shield support according to the present
disclosure is described with the following specific examples.
[0046] A method of treating tunnel collapse with a roof-contacted
shield support is mainly applied to the treatment of an initial
tunnel collapse having a relatively flat surface of the collapse
cavity 28 and ease of roof contact. The method includes the
following specific steps.
[0047] At step 1, a column 2, a fixed support column 3, a movable
support column 4, a transverse canopy 5 and a longitudinal canopy 6
are fixedly mounted on a shield plate 1 to form a combined support,
where an upper connection plate of the movable support column 4 is
fixed on an upper surface 11 of the shield plate.
[0048] Specifically, a guide hole 12, a reserved concrete hole 16
and a reserved air hole 18 are firstly opened at appropriate
positions of the selected shield plate 1 which generally is made of
a steel plate material; then, the column 2, the fixed support
column 3, the transverse canopy 5 and the longitudinal canopy 6 are
fixedly mounted on the shield plate 1 respectively; next, the
movable support column 4 is temporarily fixedly mounted on the
shield plate 1 by bolts and nuts, where the nuts are disposed on a
lower side surface of the shield plate 1. The column 2 and the
fixed support column 3 may be made of profile steels such as steel
pipes and I-steel or grids formed by welding steel bars; the
transverse canopy 5 and the longitudinal canopy 6 may be a
mining-specific metal top beam.
[0049] The combined support is a part of the roof-contacted shield
support. The roof-contacted shield support further includes a
single hydraulic prop 9, a filling material pumping pipe 15 and an
exhaust pipe 17. The transverse canopy 5 and the longitudinal
canopy 6 are fixed on a lower surface of the shield plate 1 to
improve rigidness and a bearing capacity of the shield plate 1. The
column 2 is further disposed below the shield plate to support the
plane where the shield plate 1 is located. The fixed support column
3 is fixed on the upper surface 11 of the shield plate. The movable
support column 4 is penetrated through the guide hole 12 on the
shield plate 1 and overlapped on the shield plate 1, and may extend
toward above the shield plate 1. In a case of use, the fixed
support column 3 and the movable support column 4 actively contact
a surface 25 of the collapse cavity and bear a load, that is, the
fixed support column 3 actively contacts the roof and bears the
load under the lifting-up action of the single hydraulic prop 9,
then another single hydraulic prop 9 is disposed to lift up the
movable support column 4 to actively contact the roof and bear the
load, thereby improving the roof contacting effect. The column 2,
the fixed support column 3 and the movable support column 4 each
include an upper connection plate 20, a lower connection plate 19
and a column body 21, and have similar structure. A screw hole 22
is arranged on both the upper connection plate 20 and the lower
connection plate 19 to facilitate mounting and dismounting; other
easy-to-dismount connection pieces may also be used. In addition,
components requiring no dismounting may be fixed by welding. For
example, fixed welding may be used for the extension process of the
movable support column 4.
[0050] At step 2, gravels below the collapse cavity 28 are leveled
to form an operation platform 23, and the combined support is moved
to be above the operation platform 23. Specifically, the gravels
may be leveled by using an excavator, and then, the combined
support may be moved to be above the operation platform 23 by using
the excavator. Optionally, the combined support may be fixed on a
motor vehicle which moves onto the operation platform 23 so as to
complete the lifting-up of the support and the mounting of the
initial supporting arch on the motor vehicle.
[0051] At step 3, a single hydraulic prop 9 is transported onto the
operation platform 23, and then erected, and lifted up to fit each
single hydraulic prop 9 with the transverse canopy 5 or the
longitudinal canopy 6. An upper end of the single hydraulic prop 9
is supported on the transverse canopy 5 or the longitudinal canopy
6, and a lower end of the single hydraulic prop 9 is fixed on the
ground by a prop shoe 7. The minimum height of the single hydraulic
prop 9 after retraction is less than the height of the column 2,
and the maximum height of the single hydraulic prop 9 after
extension is greater than the height of the column 2.
[0052] Specifically, the single hydraulic prop 9 may be moved to be
below the combined support under the protection of bucket of the
excavator, and a pull rod may be further disposed between the
single hydraulic props 9 for combination connection to ensure the
overall stability. The number of single hydraulic props 9 used may
be designed according to the scope of the collapse cavity 28 and
the size of the combined support. Further, the mounting position of
the single hydraulic prop 9 may be determined according to actual
site conditions, and a prop shoe 7 is mounted on each single
hydraulic prop 9 one by one. The prop shoe 7 may be aligned with
the transverse canopy 5 or the longitudinal canopy 6 so that the
single hydraulic prop 9 can be fitted with a toothed groove 13 of
the transverse canopy 5 or the longitudinal canopy 6 after lifting,
thereby ensuring firm fitting. The prop shoe may also be fixedly
connected by a rigid structure which may specifically be a seat or
a connection groove made of a steel material. The prop shoe is
directly fixed in the seat or the connection groove. In this case,
the stability of the rigid structure may be further guaranteed by
increasing a contact area with the platform, reducing center of
gravity or increasing weight, or the like.
[0053] At step 4, the lifting-up of the single hydraulic prop 9 is
continued to enable heights of the transverse canopy 5, the
longitudinal canopy 6, the shield plate 1 and a guide pipe 14 to be
greater than the mounting height of an outer contour line 24 of the
initial supporting arch, that is, the lifting-up heights of the
transverse canopy 5, the longitudinal canopy 6 and the guide pipe
14 of the combined support are all greater than the height of the
outer contour line 24 of the initial supporting arch. After the
fixed support column 3 contacts the surface 25 of the collapse
cavity, the bearing capacity of the single hydraulic prop 9 is
slowly increased to a rated working resistance, and then, a liquid
supply valve is locked.
[0054] The initial supporting arch 26 is a grid support for initial
tunnel supporting, which is formed by processing metal profile
steels or welding steel bars.
[0055] At step 5, a single hydraulic prop 9 is disposed below the
movable support column 4 and bolts 8 connecting the movable support
column 4 and the shield plate 1 are removed to fit a top cover of
the single hydraulic prop with the lower connection plate 19 of the
movable support column 4, so as to continue lifting the single
hydraulic prop 9 below the movable support column 4. When the upper
connection plate of the movable support 4 contacts the surface 25
of the collapse cavity, a bearing capacity of the single hydraulic
prop 9 is slowly increased to a rated working resistance, and then,
a liquid supply valve is locked.
[0056] The shield plate 1 and the movable support column 4 have the
following specific structures. The guide pipe is disposed inside
the guide hole 12 of the shield plate to guide and limit a
lifting-up direction of the movable support column 4, thereby
preventing the movable support column 4 from falling sidewise or
inclining during lifting-up, and facilitating up and down movement
of the movable support column 4. The movable support column 4 moves
along the guide pipe 14 in cooperation with the guide pipe 14, and
is sleeved into the guide pipe 14. Each movable support column 4
includes an upper connection plate 20, a lower connection plate 19
and a column body 21, and a screw hole 22 is arranged on both the
upper connection plate 20 and the lower connection plate 19. The
contour size of the lower connection plate 19 of the movable
support column 4 is smaller than that of an inner wall of the guide
pipe 14, and a toothed groove 13 mated with the top cover of the
single hydraulic prop 9 is further disposed on the lower connection
plate 19. The contour size of the upper connection plate of the
movable support column 4 is greater than that of the guide hole 12,
and the upper connection plate of the movable support column 4 is
fixed on the upper surface 11 of the shield plate by bolts 8. The
movable support column 4 is overlapped on the shield plate 1 in a
connection manner as shown in FIG. 13 or FIG. 14. In the example of
FIG. 13, an end of the guide pipe 14 is fixed on a lower side
surface of the shield plate 1 by welding, the upper connection
plate of the movable support column 4 and the column body 21 are
fixed by welding, and a screw hole 22 is disposed on the upper
connection plate to mate with the screw hole on the shield plate 1.
When the combined support is mounted, the movable support column 4
is fixed by bolts 8, and may move upward after the bolts 8 are
removed. In the example of FIG. 14, a middle portion of the guide
pipe 14 is fixed on the shield plate 1 by welding, the upper
connection plate of the movable support column 4 and the column
body 21 are fixed by welding, an insertion groove is formed between
the upper connection plate and the column body, and the guide pipe
14 is inserted into a space between the upper connection plate and
the column body. In addition, one or more movable support columns 4
may be further disposed on the shield plate 1 or disposed according
to the shape of the collapse cavity 28, and the movable support
column 4, the guide hole 12 and the guide pipe 14 are
correspondingly arranged in number and structure. The fixed support
column 3 may be arranged at both sides of the movable support
column 4, or may be flexibly disposed according to the shape of the
collapse cavity 28; a plurality of fixed support columns 3 may be
disposed on the shield plate 1, and the fixed support column 3 may
be fixed on the shield plate 1 through the screw hole of the lower
connection plate 19 or fixed on the shield plate 1 by welding.
Generally, the fixed support column 3 is perpendicular to the
shield plate 1, or may form an included angle with the shield plate
1 to adapt to different collapse cavities.
[0057] At step 6, the initial supporting arch 26 is erected below
the shield plate 1 and then connected with the initial supporting
arch 26 to form an initial supporting shed 27. When the initial
supporting shed is disposed at a position adjacent to the collapse
cavity 28 in the tunnel, the initial supporting arch newly-erected
below the shield plate 1 is fixedly connected together with
original supporting structures such as the initial supporting shed,
where the original supporting structures further include an initial
supporting arch, an anchor bolt, an anchor cable and an anchor net,
and the like.
[0058] The initial supporting arch newly-erected below the shield
plate 1 is fixedly connected together with the original initial
supporting shed by using metal materials such as steel bars and
profile steels, so as to form the stable initial supporting
shed.
[0059] In addition, when the single hydraulic prop 9 occupies the
mounting position of the initial supporting arch, an alternative
single hydraulic prop is firstly erected at a position adjacent to
the single hydraulic prop, and then, the single hydraulic prop 9
occupying the mounting position of the initial supporting arch is
removed.
[0060] At step 7, intersection points of the initial supporting
arch 26 and the column 2/the movable support column 4 is fixed by
welding, and the parts of the column 2 and the movable support
column 4 in the contour of the initial supporting arch are cut
off
[0061] After the operation of step 7 is completed, the supporting
of the collapse zone is smoothly transferred from the combined
support and the single hydraulic prop to the initial supporting
shed., that is, the load of the shield plate is transferred from
the single hydraulic prop 9 to the initial supporting shed, where
the load of the shield plate includes dead-weight of the shield
plate structure and a pressure transmitted to the shield plate 1
from above.
[0062] At step 8, after the single hydraulic props 9 are removed, a
filling material pumping pipe 15 is inserted into a reserved
concrete hole 16 of the shield plate, an exhaust pipe 17 is
inserted into a reserved air hole 18, and a metal net is hung on
the initial supporting arch 26. The slurry discharge height of the
filling material pumping pipe 15 should be close to the top of the
collapse cavity as possible, an anti-clogging top cover may be
disposed at an end of the exhaust pipe 17, and the exhaust pipe 17
will be protruded to furthest above the collapse cavity as
possible.
[0063] At step 9, fast-setting concrete is sprayed to the initial
supporting arch 26, a filling material is injected into the
collapse cavity through the filling material pumping pipe 15, and
air in the collapse cavity is discharged through the exhaust pipe
17 until the collapse cavity is filled up with the filling
material.
[0064] Specifically, the fast-setting concrete is firstly sprayed
to the initial supporting arch 26 in the tunnel to form a closed
shell, and then, the filling material is injected into the collapse
cavity 28 through the filling material pumping pipe 15, and the air
in the collapse cavity 28 is emptied through the exhaust pipe 17
during the pumping. The filling material may be an organic or
inorganic filling material such as concrete, foamed concrete,
Marithan, or the like.
[0065] In the method of treating tunnel collapse, the operation of
each step is carried out in a safe operation space, so that the
method is particularly applicable to the collapse treatment of an
initial tunnel collapse having a relatively flat surface of the
collapse cavity 28 and ease of roof contact. The method active
provides the supporting force by cooperation of the single
hydraulic props and the support columns to ensure the supporting
safety. The mounting of the initial supporting arch is convenient,
the structure of each part of the roof-contacted shield support
will not invade into the operation space of initial supporting, and
the erected initial supporting arch will also not invade into the
operation space of secondary lining operation, thereby avoiding the
removal operation of the initial supporting arch during the
subsequent secondary lining operation. In addition, the method also
improves the safety and mechanization level of the operation below
the collapse cavity.
[0066] Certainly, the foregoing descriptions are not intended to
limit the present disclosure, and the present disclosure is also
not limited to the above examples. Changes, modifications,
additions or substitutions made by persons skilled in the art
within the scope of essence of the present disclosure shall also be
encompassed in the scope of protection of the present
disclosure.
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